'Illegal' gear combination.

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A bike has for example, a rear cassette composed of 7 gears (cogs), and two gears on the front crank. I heard it would be 'illegal' to set the chain on the largest gear on the front crank and the largest on the rear cassette, or similarly a combination of smallest smallest.

I've searched google but can't find anything, also never heard of this before.

Can anyone explain what it means to have these 'illegal' gear combinations?
 

deptfordmarmoset

Full time tea drinker
Not illegal, simply ill-advised because an excessively ''crossed'' chain will wear out your chain.
 

MattHB

Proud Daddy
A 7 speed chain is quite resilient though. I'd not overly worry about it. Plenty of people ride to the extreme sides of the cassette in relation to front ring
 
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